Process for manufacturing thiophene derivatives

Details Process for manufacturing thiophene derivatives Process for manufacturing thiophene derivatives

1975-06-04

1976-11-16

Thomas, Jr., James O.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260329AM, 260329HS, 260329F, C07D33300

Patent

active

039924106

ABSTRACT:
Process for the manufacture of salts of 2-aminothiophenes having the formula: ##SPC1##
Wherein R, X and Y are each independently a hydrogen atom, an alkyl radical or an optionally substituted aryl radical, or a thienyl or furyl radical or either R and X or X and Y together form a chain or methylene groups to form a 5- or 6- membered fused ring system, which comprises treating the corresponding compound of the formula: ##EQU1## with hydrogen sulphide in the presence of an acid and in the presence of an organic solvent, and the use of the said salts as diazo components in the manufacture of azo dyestuffs.

REFERENCES:
patent: 2570083 (1951-10-01), Wadley

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